you won't be able to change the geometry just by replacing the top yoke - think of it as just a way of linking the forks to the steering damper and you'll see what i mean.
You may have loosened the headbearing somehow, or the steering damper is rubbing on the tank or something else
I seriously doubt you have altered the geometry - would be one hell of a cheap way to do so!
[Edited on 28-5-2004 by DJ Tera]